Process for manufacturing a soda ash peroxygen carrier

Abstract

A novel process is claimed for manufacturing a composition of matter comprising particles which appear to comprise sodium carbonate, sodium carbonate peroxide and a stabilizer such as, a disphosphonic acid, the anhydrous sodium carbonate being present in sufficient quantity to form sodium carbonate monohydrate by reacting with all of the water formed on decomposition of the sodium percarbonate.

We claim: 
     
       1. A process for manufacturing a soda ash peroxygen carrier composition comprising incorporating into an aqueous solution of 50% to 80% by weight hydrogen peroxide a diphosphonic acid or salt having a formula of ##STR2## wherein Y is hydrogen or hydroxyl, R is hydrogen or an aliphatic group having one to six carbons, to form a mixed solution, uniformly applying the mixed solution to a solid particulate reaction mixture initially comprising substantially anhydrous particles of sodium carbonate, concomitantly urging water vapor from the surface of the reaction mixture, and maintaining the temperature of the reaction mixture between about 35° C. and 80° C., said diphosphonic acid or salt being present in an amount to provide 0.1% to 3% diphosphonic acid or salt in the composition thereby providing as product a soda ash peroxygen carrier assaying 45% to 75% as sodium carbonate perhydrate and containing between 1 to 5 moles of sodium carbonate for each mole of available water in the composition, said available water consisting essentially of water chemically available as hydrogen peroxide, water of crystallization and free water. 
     
     
       2. The process of claim 1 wherein Y is hydroxyl, and R is methyl.